CEF截图
记录目前两种实现方式
[DllImport("user32.dll")] private static extern bool PrintWindow(IntPtr hwnd, IntPtr hdcBlt, uint nFlags); public void WriteBmp(string bmpPath) { int screenWidth = webbrowser.Document.Body.ScrollRectangle.Width; int screenHeight = webbrowser.Document.Body.ScrollRectangle.Height; IntPtr myIntptr = webbrowser.Handle; int hwndInt = myIntptr.ToInt32(); IntPtr hwnd = myIntptr; // Set hdc to the bitmap Bitmap bm = new Bitmap(screenWidth, screenHeight); Graphics g = Graphics.FromImage(bm); IntPtr hdc = g.GetHdc(); // Snapshot the WebBrowser bool result = PrintWindow(hwnd, hdc, 0); g.ReleaseHdc(hdc); g.Flush(); // Save the bitmap, if successful if (result == true) bm.Save(bmpPath); }
第二种
public static class ApiConstants { public const int SRCCOPY = 13369376; } public static class Utilities { public static Image CaptureScreen() { return CaptureWindow(User32.GetDesktopWindow()); } public static Image CaptureWindow(IntPtr handle) { IntPtr hdcSrc = User32.GetWindowDC(handle); RECT windowRect = new RECT(); User32.GetWindowRect(handle, ref windowRect); int width = windowRect.right - windowRect.left; int height = windowRect.bottom - windowRect.top; IntPtr hdcDest = Gdi32.CreateCompatibleDC(hdcSrc); IntPtr hBitmap = Gdi32.CreateCompatibleBitmap(hdcSrc, width, height); IntPtr hOld = Gdi32.SelectObject(hdcDest, hBitmap); Gdi32.BitBlt(hdcDest, 0, 0, width, height, hdcSrc, 0, 0, ApiConstants.SRCCOPY); Gdi32.SelectObject(hdcDest, hOld); Gdi32.DeleteDC(hdcDest); User32.ReleaseDC(handle, hdcSrc); Image image = Image.FromHbitmap(hBitmap); Gdi32.DeleteObject(hBitmap); return image; } } public static class User32 { [DllImport("user32.dll")] public static extern IntPtr GetDesktopWindow(); [DllImport("user32.dll")] public static extern IntPtr GetWindowDC(IntPtr hWnd); [DllImport("user32.dll")] public static extern IntPtr GetWindowRect(IntPtr hWnd, ref RECT rect); [DllImport("user32.dll")] public static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDC); } public class Gdi32 { [DllImport("gdi32.dll")] public static extern bool BitBlt(IntPtr hObject, int nXDest, int nYDest, int nWidth, int nHeight, IntPtr hObjectSource, int nXSrc, int nYSrc, int dwRop); [DllImport("gdi32.dll")] public static extern IntPtr CreateCompatibleBitmap(IntPtr hDC, int nWidth, int nHeight); [DllImport("gdi32.dll")] public static extern IntPtr CreateCompatibleDC(IntPtr hDC); [DllImport("gdi32.dll")] public static extern bool DeleteDC(IntPtr hDC); [DllImport("gdi32.dll")] public static extern bool DeleteObject(IntPtr hObject); [DllImport("gdi32.dll")] public static extern IntPtr SelectObject(IntPtr hDC, IntPtr hObject); } [StructLayout(LayoutKind.Sequential)] public struct RECT { public int left; public int top; public int right; public int bottom; } }
引用https://www.cnblogs.com/jackhuclan/archive/2012/04/23/1909301.html
新增
第三种,使用前端库截图, 这里截图直接是指定元素的全图,包括滚动条不可见部分,避免了使用windows句柄截图只能截取可视区域。
dom-to-image
添加引用
<script src="dom-to-image/dom-to-image.js"></script>
添加截图方法
function shotScreenAsync() { return new Promise((resolve, rejece) => { var appElement = document.getElementById('app'); domtoimage.toPng(appElement, { bgcolor: "#ffffff", style: { overflow: "" } }).then(data => { resolve(data); }).catch(error => { rejece(error) }); }) }
本文来自博客园,作者:广林,转载请注明原文链接:https://www.cnblogs.com/guanglin/p/12168254.html